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from __future__ import print_function
import sys
from contextlib import contextmanager
import epics
import multiprocessing as mp
import pytest
import pvnames
PVS = [pvnames.double_pv, pvnames.double_pv2]
@contextmanager
def pool_ctx():
pool = epics.CAPool()
yield pool
pool.close()
pool.join()
@pytest.mark.skipif(sys.version_info >= (3, 0),
reason='CAPool not functioning in Python 3')
def test_caget():
with pool_ctx() as pool:
print('Using caget() in subprocess pools:')
print('\tpool.process =', pool.Process)
values = pool.map(epics.caget, PVS)
for pv, value in zip(PVS, values):
print('\t%s = %s' % (pv, value))
def _manager_test_fcn(pv_dict, pv):
pv_dict[pv] = epics.caget(pv)
@pytest.mark.skipif(sys.version_info >= (3, 0),
reason='CAPool not functioning in Python 3')
def test_manager():
'''
Fill up a shared dictionary using a manager
'''
with pool_ctx() as pool:
print('Multiprocessing Manager test:')
manager = mp.Manager()
pv_dict = manager.dict()
results = [pool.apply_async(_manager_test_fcn, [pv_dict, pv])
for pv in PVS]
print('\tResulting pv dictionary: %s' % pv_dict)
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